Original MRI performed prior to surgery

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Large well-established OCD (arrow) on lateral aspect of the medial femoral condyle with a large cavity and separated osteochondral fragment sitting in the supra-patellar recess laterally (arrow)

Case Discussion

Once the OCD fragment has separated it is still worthwhile attempting to reattach in order to establish a smooth articular surface. When reporting MRI it is important to localize the fragment for the surgeon.